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Software for Signboard 2
[All LED goes OFF]




This routine sholud be put on the main process.
Function
    This routine turns off all LEDs at the same time.

Source code

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;*******************  All OFF Process  *****************
all_off
        movlw   d'16'           ;Set loop count
        movwf   lpcnt           ;Save loop count
        movlw   d'15'           ;Set row index
        movwf   rowindex        ;Save row index
all_off_loop
        movlw   scrnhd          ;Set table head address
        addwf   rowindex,w      ;Head + Index
        movwf   fsr             ;Set table address
        movlw   h'7f'           ;Set OFF data
        movwf   indf            ;Write data
        decf    rowindex,f      ;Index - 1
        decfsz  lpcnt,f         ;Loop end ?
        goto    all_off_loop    ;No. Next row
        call    led_cnt         ;LED control
        return


Explanation
    It sets going-out data '1' directly in the screen area(10h-1Fh).
    It calls LED control subroutine when finishing setting all data and it turns off LEDs.
    To turn off LEDs, it clears only screen area. The data of the screen workarea is saved. So, it is possible to make a display blink if it does combination with "Flash".